16625261 has 2 divisors, whose sum is σ = 16625262. Its totient is φ = 16625260.

The previous prime is 16625243. The next prime is 16625267. The reversal of 16625261 is 16252661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10956100 + 5669161 = 3310^2 + 2381^2 .

It is a cyclic number.

It is not a de Polignac number, because 16625261 - 2¹⁴ = 16608877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16625267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8312630 + 8312631.

It is an arithmetic number, because the mean of its divisors is an integer number (8312631).

Almost surely, 2^16625261 is an apocalyptic number.

It is an amenable number.

16625261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16625261 is an equidigital number, since it uses as much as digits as its factorization.

16625261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 16625261 is about 4077.4086133229. The cubic root of 16625261 is about 255.2247716984.

The spelling of 16625261 in words is "sixteen million, six hundred twenty-five thousand, two hundred sixty-one".